Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: qual é o tonelagem do navio koningin juliana?
 ###Tabelas: CREATE TABLE singles_21–5 (singles_21–5_id AUTO_INCREMENT PRIMARY KEY, Edition VARCHAR, Round VARCHAR, Date VARCHAR, Surface VARCHAR, Opponent VARCHAR, Result VARCHAR) CREATE TABLE ships_operated_by_zeeland_steamship_company_smz (ships_operated_by_zeeland_steamship_company_smz_id AUTO_INCREMENT PRIMARY KEY, Ship's name VARCHAR, Date entered service VARCHAR, Date withdrawn VARCHAR, Tonnage INT, Type of Ship VARCHAR) CREATE TABLE politics (politics_id AUTO_INCREMENT PRIMARY KEY, Index VARCHAR, Organization VARCHAR, Year VARCHAR, Rank INT, Out of INT) CREATE TABLE group_4 (group_4_id AUTO_INCREMENT PRIMARY KEY, Home team VARCHAR, Home team score VARCHAR, Away team VARCHAR, Away team score VARCHAR, Ground VARCHAR, Date VARCHAR, Crowd INT) CREATE TABLE table_of_sentences (table_of_sentences_id AUTO_INCREMENT PRIMARY KEY, Tribunal VARCHAR, Number of autos da fé with known sentences VARCHAR, Executions in persona VARCHAR, Executions in effigie VARCHAR, Penanced VARCHAR, Total VARCHAR)  
SELECT Tonnage FROM ships_operated_by_zeeland_steamship_company_smz WHERE Ship's name = koningin juliana